Rear vehicle-body structure of vehicle

ABSTRACT

A vehicle-body structure for suppressing deformation of a lift gate opening is provided. Embodiments include a vehicle having a rear annular framework formed from a cross member, side braces, connecting members, and a rear header; a rear suspension on lower surfaces of side pillars in the same position as the cross member in a vehicle front-rear direction; and wheel well inner portions on the vehicle rear side with respect to the cross member, each having an upper end having a damper supporting portion for mounting a suspension damper. The side braces each connect a place near the cross member and a place near the damper supporting portion to each other in a vehicle up-down direction; and the connecting members each connect a place near each end portion of the rear header in a vehicle width direction and the place near the damper supporting portion to each other.

TECHNICAL FIELD

The present disclosure relates to a vehicle-body structure of a vehicle forming an annular structure that is substantially annular in front view; for example, on the rear side of suspension dampers.

BACKGROUND ART

For example, Japanese Patent Laid Open No. 2019-151287 discloses a vehicle-body structure of a vehicle in which a vehicle-width-direction substantially-annular vehicle body framework that is substantially annular in vehicle-body front view and vehicle-body plan view is formed by a rear end cross that extends in the vehicle width direction, a pair of left and right gusset members, upper thick-wall forming portions of rear wheel wells having a pair of left and right damper supporting portions, a pair of left and right wheel well reinforcements, and a floor rear-side cross member that extends in the vehicle width direction on the rear side of a vehicle. By providing the annular structure in which the plurality of members as above are annularly connected to each other on the vehicle rear side, the rigidity of the vehicle rear side can be improved.

In a vehicle of which convenience is improved by securing the capacity of a trunk provided on the vehicle rear side, for example, a structure in which rear damper supporting portions and a lift gate opening are spaced apart from each other in the front-rear direction is provided. In this case, even when the vehicle-width-direction substantially-annular vehicle body framework is provided on the rear side of the vehicle as in Japanese Patent Laid Open No. 2019-151287, the load input from a suspension is mainly in the up-down direction, and hence there is a fear that the up-down-direction load input to the rear damper supporting portions and suspension mounting portions may cause a large displacement in the up-down direction in a back end portion of the vehicle and a distorted deformation may be caused in the lift gate opening depending on conditions of the vehicle weight and the rear overhang.

SUMMARY

In view of the abovementioned problem, the present disclosure provides a vehicle-body structure of a vehicle capable of suppressing a distorted deformation of a lift gate opening.

The present disclosure relates to a vehicle-body structure of a vehicle, including, on a vehicle rear side: a pair of left and right rear side frames that extend in a vehicle front-rear direction; a cross member that connects the rear side frames to each other in a vehicle width direction; and a rear header that extends in the vehicle width direction on an upper side of a lift gate opening. The vehicle-body structure includes: a pair of left and right suspension mounting portions disposed on lower surfaces of the rear side frames and in a substantially same position as the cross member in the vehicle front-rear direction; a pair of left and right rear wheel wells disposed on a vehicle rear side with respect to the cross member and each having an upper end having a damper top on which an upper end of a suspension damper is mounted; a pair of left and right side braces that each connect a place near the cross member and a place near the damper top to each other in the vehicle up-down direction; and a pair of left and right connecting members that each connect the place near the damper top and a place near each end portion of the rear header in the vehicle width direction to each other. In the vehicle-body structure, the cross member, the pair of left and right side braces, the pair of left and right connecting members, and the rear header form an annular structure that is substantially annular in front view.

By the present disclosure, the distorted deformation of the lift gate opening can be suppressed. More particularly, by connecting the place near each of the pair of left and right damper tops and the place near each end portion of the rear header in the vehicle width direction to each other by each of the pair of left and right connecting members, the cross member, the pair of left and right side braces, the pair of left and right connecting members, and the rear header can form the annular structure that is substantially annular in front view.

The cross member that forms the annular structure is disposed in the substantially same position as the suspension mounting portion in the vehicle front-rear direction, and the connecting member is connected to the place near the damper top. Hence, the up-down-direction load input to the suspension mounting portion and the damper top can be received by the annular structure.

In other words, the annular structure that is substantially annular in front view can transmit the up-down-direction load input to the suspension mounting portion and the damper top to the place near the rear header as an axial force, and hence the displacement of the suspension mounting portion and the damper top can be suppressed. Therefore, the distorted deformation of the lift gate opening can be suppressed.

As an aspect of the present disclosure, the connecting members may extend along the side braces so as to be substantially parallel to the side braces. According to the present disclosure, the transmission direction of the up-down-direction load input from the suspension mounting portion and the damper top can be transmitted to the connecting members via the side braces in a continuous manner, and the up-down-direction load can be transmitted in a more efficient manner. Therefore, the input up-down-direction load can be more efficiently transmitted to the place near the rear header as the axial force.

As an aspect of the present disclosure, the rear wheel wells may each have a ridge portion at which an arc-shaped wheel well upper surface that protrudes toward the upper side and a wheel well inner surface formed on an inner side in the vehicle-width-direction intersect with each other provided thereon, and each of the connecting members may be connected to the ridge portion.

According to the present disclosure, the connecting member can be connected to the ridge portion of which rigidity is relatively high as compared to other places of a rear wheel damper, and hence the up-down-direction load input from the suspension mounting portions and the damper tops can be transmitted to the rear header in a continuous manner. As a result, the distorted deformation of the lift gate opening can be suppressed more.

As an aspect of the present disclosure, a rear pillar that extends from the rear header to a lower side and forms the lift gate opening may be included, the connecting members may each include a flat surface portion facing in the vehicle width direction from a damper-top-side end portion fixed to the damper top to a rear-header-side end portion fixed to the rear header, and the flat surface portion may be fixed to one surface of the rear pillar facing in the vehicle width direction and one surface near the damper top. The expression of “facing in the vehicle width direction” described above does not only mean a case where the vehicle width direction matches with a perpendicular line direction orthogonal to the flat surface portion, and may be a direction in which the vehicle width direction intersects with the vertical direction at an angle less than 45 degrees.

According to the present disclosure, the flat surface portion can connect the place near the damper top and the rear pillar to each other in a state of facing in the vehicle width direction without being twisted or curved. Therefore, the connecting portion can transmit the up-down-direction load input from the road surface via the rear suspension damper to the place near the rear header as the axial force in a more efficient manner.

As an aspect of the present disclosure, the connecting members may each have a bead that extends in a longitudinal direction provided thereon. The bead may be provided such that one bead is provided in the longitudinal direction of the connecting member from the base end side to the distal end side, or a plurality of beads may be disposed in the longitudinal direction of the connecting member in a continuous manner.

According to the present disclosure, the rigidity of the connecting members can be improved without increasing the mass of the connecting members. Thus, the up-down-direction load input from the road surface via the rear suspension dampers can be reliably transmitted by the connecting members. Therefore, the distorted deformation of the lift gate opening can be suppressed in a more reliable manner.

As an aspect of the present disclosure, a rear pillar that extends from the rear header to a lower side and forms the lift gate opening, and a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other may be included.

According to the present disclosure, the rigidity can be improved and the up-down-direction load input from the damper top can be distributed to the connecting member and the gusset member in a more reliable manner. As a result, the distorted deformation of the lift gate opening can be suppressed in a more reliable manner.

According to the present disclosure, the vehicle-body structure of the vehicle capable of suppressing the distorted deformation of the lift gate opening can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a vehicle-body structure of a rear portion of a vehicle of an embodiment of the present disclosure seen from the front side.

FIG. 2 is a cross-sectional plan view of the rear portion of the vehicle of the embodiment of FIG. 1.

FIG. 3 is a side view illustrating the main part of the vehicle-body structure of the rear portion of the vehicle of the embodiment of FIG. 1 from the inner side.

FIG. 4 is a front view of a gusset member.

FIG. 5 is a cross-sectional view taken along line B-B in FIG. 4.

FIG. 6 is a front view of a connecting member.

FIG. 7 is a cross-sectional view taken along line C-C in FIG. 6.

FIGS. 8A and 8B are explanatory views of the mounting of the connecting member.

FIG. 9 is an explanatory view for describing an annular vehicle body framework.

DETAILED DESCRIPTION

An embodiment of the present disclosure is described in detail with reference to the drawings below. A vehicle 1 of this embodiment is a so-called hatchback vehicle in which a trunk is provided on the vehicle rear side of a vehicle cabin that is boarded and alighted from by an occupant and the vehicle rear side of the trunk is covered with a back door (also referred to as a lift gate) in an openable and closable manner A vehicle-body structure of the vehicle 1 as above is described with reference to FIG. 1 to FIG. 9.

FIG. 1 illustrates a perspective view of a rear vehicle seen from the front side, FIG. 2 illustrates a cross-sectional plan view of the rear vehicle that is cut at a substantially central portion in the height direction seen from the upper side, and FIG. 3 illustrates a side view of a rear vehicle body seen from the inner side that is an arrow cross-sectional view taken along line A-A in FIG. 2.

FIG. 4 illustrates a front view of a gusset member 51 seen from the vehicle-width-direction inner side, FIG. 5 illustrates an arrow cross-sectional view taken along line B-B in FIG. 4, FIG. 6 illustrates a front view of a connecting member 52 seen from the vehicle-width-direction inner side, FIG. 7 illustrates an arrow cross-sectional view taken along line C-C in FIG. 6, FIGS. 8A and 8B are explanatory views of the mounting of the connecting member, and FIG. 9 illustrates a perspective view of the rear vehicle seen from the front side in order to describe an annular vehicle body framework F formed by the connecting member 52. The vehicle-body structure of the rear portion of the vehicle 1 of this embodiment is bilaterally symmetrical, and hence only the vehicle body right side is illustrated in FIG. 2, FIG. 3, and FIG. 8.

In the drawings, arrows Fr and Rr indicate the front-rear direction, arrow Fr indicates the front side, and arrow Rr indicates the rear side. Arrows Rh and Lh indicate the width direction, arrow Rh indicates the right direction, and arrow Lh indicates the left direction. Arrow IN indicates the vehicle-width-direction inner side, and arrow OUT indicates the vehicle-width-direction outer side.

As illustrated in FIG. 1, the vehicle 1 of this embodiment includes a pair of left and right side sills 11 that extend in the vehicle front-rear direction at positions spaced apart from each other at a predetermined interval in the vehicle width direction, a pair of left and right rear side frames 12 that are connected to back ends of the side sills 11 and extend to the vehicle rear side, a floor panel 13 that forms a floor of the vehicle 1 between the pair of left and right side sills 11 and the pair of left and right rear side frames 12, and a first floor cross member 14 that connects the pair of left and right rear side frames 12 to each other in the vehicle width direction.

As illustrated in FIG. 1 and FIG. 3, on the vehicle upper side with respect to the pair of left and right side sills 11, the vehicle 1 includes a pair of left and right roof side rails 21 that extend in the vehicle front-rear direction at positions spaced apart from each other at a predetermined interval in the vehicle width direction, a roof panel 22 that connects the pair of left and right roof side rails 21 to each other in the vehicle width direction, a roof reinforcement (not shown), a rear header 23, and a pair of left and right rear pillars 24 that extend to the vehicle rear side and lower side from back ends of the roof side rails 21.

As illustrated in FIG. 1, the vehicle 1 includes a rear end 31 that connects the pair of left and right rear pillars 24 to each other in the vehicle width direction and forms a rear wall of the trunk, a pair of left and right rear side panels 32 that form side walls of the vehicle 1, a pair of left and right side pillars 33 that connect rear portions of the side sills 11 and the roof side rails 21 to each other, and a pair of left and right wheel well inner portions 34 that cover rear wheels (not shown) of the vehicle 1 on the vehicle front side with respect to the rear end 31.

An opening surrounded by the rear header 23, the pair of left and right rear pillars 24, and the rear end 31 is a back door opening S1 covered by the back door in an openable and closeable manner. An opening surrounded by the side sill 11, the roof side rail 21, the side pillar 33, and a hinge pillar (not shown) that connects the side sill 11 and the roof side rail 21 to each other on the front side of the vehicle 1 is a side door opening S2, which is covered by a side door in an openable and closeable manner and through which the occupant performs the boarding and the alighting.

As illustrated in FIG. 1, the pair of left and right side sills 11 are members forming a vehicle body framework of a vehicle lower portion and are each formed in a shape, which has a length in the vehicle front-rear direction and of which back end is positioned on the vehicle front side with respect to the first floor cross member 14 and front end is positioned on a front end of the vehicle cabin.

The side sill 11 forms a closed cross-section that extends in the vehicle front-rear direction and joins a side sill inner portion (not shown) positioned on the vehicle-width-direction inner side and a side sill outer portion (not shown) positioned on the vehicle-width-direction outer side to each other in the vehicle width direction.

As illustrated in FIG. 1, the pair of left and right rear side frames 12 are members forming the vehicle body framework of the vehicle lower portion and have front ends joined to the back ends of the side sills 11 via the first floor cross member 14 and back ends joined to the rear end 31.

The rear side frame 12 includes a side frame lower portion (not shown), which is positioned on the vehicle lower side and of which cross-sectional shape in a vertical cross-section along the vehicle width direction is a cross-section having a substantially hat-shaped profile that protrudes to the vehicle lower side, and a side frame upper portion (not shown), which is positioned on the vehicle upper side and of which cross-section is substantially plate-shaped. By joining the side frame lower portion and the side frame upper portion to each other in the vehicle up-down direction, the rear side frame 12 forms a closed cross-section that extends in the vehicle front-rear direction.

As illustrated in FIG. 1 to FIG. 3, the floor panel 13 is a panel member forming the floor of the vehicle 1 between the pair of left and right side sills 11 and the pair of left and right rear side frames 12.

As illustrated in FIG. 1 to FIG. 3, the first floor cross member 14 connects places near front ends of the pair of left and right rear side frames 12 and front end lower portions of the pair of left and right wheel well inner portions 34 described below to each other in the vehicle width direction and forms a vehicle body framework that extends in the vehicle width direction with the floor panel 13.

As illustrated in FIG. 1, the first floor cross member 14 includes a cross member 14 a joined to the floor panel 13, and a pair of left and right side braces 14 b that extend to the vehicle upper side and rear side from both ends of the cross member 14 a in the vehicle width direction.

As illustrated in FIG. 3, the cross member 14 a is formed to have a cross-section having a substantially hat-shaped profile that protrudes to the vehicle upper side in a vertical cross-section along the vehicle front-rear direction. As illustrated in FIG. 2, the side brace 14 b is formed to have a cross-section having a substantially hat-shaped profile that is continuous from the cross member 14 a and in a shape that extends to the vehicle upper side and rear side from the cross member 14 a so as to be provided along the wheel well inner portion 34.

As illustrated in FIG. 3, on the vehicle lower side of the cross member 14 a, a second floor cross member 15 that connects the pair of left and right rear side frames 12 to each other is disposed. As illustrated in FIG. 3, the second floor cross member 15 has a cross-sectional shape in a vertical cross-section along the vehicle front-rear direction that is formed to be a cross-section having a substantially hat-shaped profile that protrudes to the vehicle lower side. The second floor cross member 15 forms a closed cross-section that extends in the vehicle width direction by being joined to the first floor cross member 14 such that the floor panel 13 is interposed therebetween.

As illustrated in FIG. 3, a torsion-beam rear suspension 17 is provided on the lower side of the first floor cross member 14 and the second floor cross member 15. Specifically, as illustrated in FIG. 3, the rear suspension 17 includes a pair of left and right trailing arms 17 a that are closed cross-sectional members that extend in the vehicle front-rear direction so as to be spaced apart from each other at a predetermined interval in the vehicle width direction, a cross beam 17 b that connects front portions of the trailing arms 17 a to each other in the vehicle width direction, and a pair of left and right spring seats 17 c on which coil springs C are placed, and is suspended between bottom portions (lower surfaces of the side pillars 33) of the vehicle 1.

As illustrated in FIG. 3, in the rear suspension 17, the trailing arms 17 a are provided on the front side, and the spring seats 17 c on which the coil springs C are mounted are provided on the rear side via the cross member 14 a. In other words, the rear suspension 17 is disposed in the substantially same position as the cross member 14 a in the vehicle front-rear direction.

In the rear suspension 17 formed as above, suspension dampers 18 that extend in the up-down direction on the wheel assembly upper side are connected to the rear sides of the trailing arms 17 a connected to the lower surfaces of the side pillars 33, and the suspension dampers 18 and the coil springs C buffer the impact from the road surface. In FIG. 3, an upper end portion of the suspension damper 18 that is hidden by the wheel well inner portion 34 and cannot seen is illustrated by broken lines.

Although detailed illustrations thereof are omitted, each of the pair of left and right roof side rails 21 forms a closed cross-section that extends in the vehicle front-rear direction by joining a roof side rail outer portion having a cross-sectional shape that protrudes to the vehicle-width-direction outer side, and a roof side rail inner portion positioned on the vehicle-width-direction inner side with respect to the roof side rail outer portion and having a cross-sectional shape that protrudes to the vehicle-width-direction inner side to each other in a vertical cross-section along the vehicle width direction.

The roof side rail 21 forms a vehicle body framework that extends in the vehicle front-rear direction by forming the closed cross-section that extends in the vehicle front-rear direction by the roof side rail outer portion and the roof side rail inner portion.

As illustrated in FIG. 1, the rear header 23 connects places near joining sections between the roof side rails 21 and the rear pillars 24 to each other in the vehicle width direction. Specifically, as illustrated in FIG. 3, the rear header 23 forms a closed cross-section that extends in the vehicle width direction by joining a rear header upper portion (not shown) having a vertical cross-sectional shape that protrudes to the vehicle upper side, and a rear header lower portion 23 a positioned on the vehicle lower side with respect to the rear header upper portion and having a vertical cross-sectional shape that protrudes to the vehicle lower side to each other in a vertical cross-section along the vehicle front-rear direction.

The rear header 23 forms a vehicle body framework that extends in the vehicle front-rear direction by forming a closed cross-section that extends in the vehicle front-rear direction by the rear header upper portion and the rear header lower portion 23 a.

The pair of left and right rear pillars 24 are connected to the roof side rails 21 that extend in the vehicle front-rear direction. In other words, the pair of left and right rear pillars 24 are connected to the rear header 23 that extends in the vehicle width direction via the roof side rails 21. Specifically, as illustrated in FIG. 3, the rear pillar 24 includes a rear pillar upper portion 24 a that extends from a back end portion of the roof side rail 21 toward the rear side and the diagonally lower side, and a rear pillar lower portion 24 b that extends toward a place on the rear side and the diagonally lower side of the rear pillar upper portion 24 a.

On a surface of the rear pillar upper portion 24 a that faces the vehicle-width-direction inner side, a fastening portion 24 c to be fastened with the connecting member 52 described below is provided (see FIG. 8A). The fastening portion 24 c is provided in a place near a place above a connecting portion between the rear pillar upper portion 24 a and the roof side rail 21 and in a place near a corner portion 25 curved from a front end portion of the rear pillar upper portion 24 a to the rear header 23.

The rear pillar 24 forms a closed cross-section that extends from a back end of the roof side rail 21 to the vehicle rear side and lower side so as to be continuous with the closed cross-section of the roof side rail 21 by joining the rear pillar upper portion 24 a and the rear pillar lower portion 24 b to each other.

As illustrated in FIG. 1 and FIG. 2, the rear end 31 includes a rear end panel 35 that is a panel member serving as the rear wall of the trunk, and a rear end cross member 36 joined to a front surface of the rear end panel 35. As illustrated in FIG. 3, the rear end panel 35 is a panel member having a thickness in the vehicle front-rear direction and is disposed on a back end of the floor panel 13 so as to be provided in a protruding manner. As illustrated in FIG. 3, the rear end cross member 36 has a vertical cross-sectional shape in a vertical cross-section along the vehicle front-rear direction that is a cross-section having a substantially hat-shaped profile that protrudes to the vehicle front side, and forms a closed cross-section that extends in the vehicle width direction so as to be continuous with the closed cross-sections of the rear pillars 24 by having both ends in the vehicle width direction that are joined to the pair of left and right rear pillars 24 and having a rear surface joined to the rear end panel 35.

The rear end 31 formed as above forms a vehicle body framework that extends in the vehicle width direction by forming the closed cross-section that extends in the vehicle width direction to be continuous with the closed cross-sections in the pair of left and right rear pillars 24 by the rear end panel 35 and the rear end cross member 36.

As illustrated in FIG. 1 and FIG. 3, the pair of left and right rear side panels 32 are panel members that cover a portion surrounded by the side sills 11, the rear side frames 12, the roof side rails 21, the rear pillars 24, the rear end 31, the wheel well inner portions 34, and the side pillars 33. A front end edge of the rear side panel 32 that is a back end edge of the side door opening S2 is formed in a shape in which an upper end is positioned in the substantially same position as a lower end in the vehicle front-rear direction in side view.

As illustrated in FIG. 3, the rear side panel 32 includes a side panel lower portion 37 to which the wheel well inner portion 34 is joined, and a side panel upper portion 38 joined to an upper end of the side panel lower portion 37. The side panel lower portion 37 forms a side wall of the trunk and forms a rear wheel well 39 that covers the rear wheel with the wheel well inner portion 34 described below. Specifically, as illustrated in FIG. 1 and FIG. 2, the side panel lower portion 37 is a panel member having a thickness in the vehicle width direction and has a wheel well outer portion 37 a that is a portion that bulges out to the vehicle-width-direction outer side.

As illustrated in FIG. 1 and FIG. 3, an opening S3 opened in a substantially triangular shape in side view is formed in the side panel upper portion 38 as an opening. The opening S3 is formed as an opening on which window glass (not shown) is mounted.

As illustrated in FIG. 1 to FIG. 3, each of the pair of left and right side pillars 33 connects the rear portion of the side sill 11 and the roof side rail 21 to each other in the vehicle up-down direction along the front end edge of the rear side panel 32 that is the back end edge of the side door opening S2.

In more detail, as illustrated in FIG. 1 and FIG. 2, a horizontal cross-sectional shape of the side pillar 33 in a horizontal cross-section along the vehicle width direction is a cross-section having a substantially hat-shaped profile that protrudes to the vehicle-width-direction outer side, and the side pillar 33 has a lower end that is joined to the side sill 11 and an upper end that is joined to the roof side rail 21. The side pillar 33 has a surface on the vehicle-width-direction inner side that is joined to a surface of the rear side panel 32 on the vehicle-width-direction outer side. As a result, the side pillar 33 forms a closed cross-section that extends in the vehicle up-down direction. The side pillar 33 forms a vehicle body framework that extends in the vehicle up-down direction by forming the closed cross-section that extends in the vehicle up-down direction with the rear side panel 32.

As illustrated in FIG. 1 to FIG. 3, the pair of left and right wheel well inner portions 34 are disposed on the vehicle rear side with respect to the back end edges of the side door openings S2 and are formed to have substantially dome-like shapes that bulge out to the vehicle-width-direction inner side with respect to the rear side panel 32.

Specifically, as illustrated in FIG. 1 to FIG. 3, the wheel well inner portion 34 includes an arc-shaped wheel well upper surface 34 a that protrudes toward the upper side, a wheel well inner surface 34 b formed on the vehicle-width-direction inner side, and a ridge portion 34 c on a portion at which the wheel well upper surface 34 a and the wheel well inner surface 34 b intersect with each other. The wheel well inner portion 34 formed as above forms the rear wheel well 39 with the wheel well outer portion 37 a.

As illustrated in FIG. 1 to FIG. 3, the wheel well upper surface 34 a is formed as a rear damper supporting portion 34 d that supports an upper end of the suspension damper 18. In other words, the wheel well inner portion 34 functions as a rear suspension tower that supports the suspension damper 18.

In more detail, the rear damper supporting portion 34 d is set to have a greater plate thickness than other members. In other words, the rear damper supporting portion 34 d is formed to have a higher rigidity than peripheral sections. The upper end of the suspension damper 18 inserted through an insertion hole is fastened and fixed to the rear damper supporting portion 34 d having a high rigidity as above. In other words, the rear damper supporting portion 34 d supports the upper end of the suspension damper 18.

As illustrated in FIG. 1 to FIG. 3, the gusset member 51 connected to the rear pillar 24 is joined to the wheel well inner portion 34, and the connecting member 52 connected to the rear pillar 24 is fastened and fixed to the wheel well inner portion 34.

As illustrated in FIG. 4 and FIG. 5, the gusset member 51 is a plate-shaped component member composed of a body 51 a formed to have a substantially inverted L-shaped cross-section in vehicle front view, and a protrusion 51 b having a substantially inverted L-shaped cross-section in vehicle front view that protrudes to the vehicle-width-direction inner side from the lower end side of a front-side portion in a state in which the body 51 a is mounted from the front side to the rear side.

The body 51 a is formed to be inclined to the upper side as the body 51 a approaches the vehicle rear side in a state of being fixed to the wheel well inner portion 34. A surface of the body 51 a that faces in the vehicle width direction has the substantially same width in the front-rear direction and has a front end portion in which bolt holes 51 c through which fastening is possible with bolts are provided. In the back end portion of the body 51 a, rear-side joining portions 51 d to be coupled to the rear pillar 24 are provided on the surface that faces in the vehicle width direction.

The protrusion 51 b is formed so as to be provided along the shape of the ridge portion 34 c formed on the portion at which the wheel well upper surface 34 a and the wheel well inner surface 34 b intersect with each other, and has front-side joining portions 51 e to be joined to the wheel well inner portion 34 provided on the front end side and the lower side thereof.

As illustrated in FIG. 1 to FIG. 3, in the gusset member 51 formed as above, a front end portion of the gusset member 51 is fixed to the ridge portion 34 c in the wheel well inner portion 34 that bulges out to the vehicle-width-direction inner side so as to cover the ridge portion 34 c from the vehicle rear side and the vehicle-width-direction inner side, and a back end portion of the gusset member 51 is fixed to the rear pillar lower portion 24 b so as to cover the rear pillar lower portion 24 b from the vehicle front side and the vehicle-width-direction inner side. The gusset member 51 is joined to the rear damper supporting portion 34 d to which the upper end of the suspension damper 18 is fixed and can transmit the up-down-direction load from the suspension damper 18 to the rear side.

In this embodiment, the gusset member 51 is joined to, but not limited to, the rear damper supporting portion 34 d that corresponds to a place to which the upper end of the suspension damper 18 is fixed. For example, the gusset member 51 may be fixed to any place near the rear damper supporting portion 34 d as long as the up-down-direction load from the suspension damper 18 can be received and transmitted along the gusset member 51.

As illustrated in FIG. 1 to FIG. 3, the connecting member 52 connects the vehicle rear side of the rear damper supporting portion 34 d in the wheel well inner portion 34 and an upper end of the rear pillar upper portion 24 a to each other in the vehicle front-rear direction so as to be substantially parallel to the side brace 14 b. More particularly, as illustrated in FIG. 6 and FIG. 7, the connecting member 52 has a flat plate structure and includes a flat surface portion 52 a formed by a flat surface facing in the vehicle width direction and a bead 52 b that protrudes along the vehicle-width-direction inner side in a central portion of the flat surface portion 52 a and extends in the longitudinal direction in a fixed state. On four corners of the flat surface portion 52 a, fastening portions 52 c that can be fastened with bolts are provided. In other words, the direction orthogonal to the flat surface portion 52 a of the connecting member 52 matches with the vehicle width direction.

As illustrated in FIG. 1, FIG. 3, and FIG. 8B, the connecting member 52 formed as above has a front end that is fastened and fixed to the gusset member 51 welded and fixed to the wheel well inner portion 34 and the rear header 23, and a back end that is fastened and fixed to the rear pillar upper portion 24 a.

The coupling of the gusset member 51 and the connecting member 52 will now be described in detail with reference to FIGS. 8A and 8B. As described above, as illustrated in FIG. 8A, the gusset member 51 has a front-side portion that is welded and fixed to the ridge portion 34 c so as to cover the ridge portion 34 c from the vehicle rear side and the vehicle-width-direction inner side, and a rear-side portion that is disposed on the rear pillar lower portion 24 b so as to cover the rear pillar lower portion 24 b from the vehicle front side and the vehicle-width-direction inner side, and the rear-side joining portions 51 d and the front-side joining portions 51 e are welded and fixed to the rear pillar lower portion 24 b and the wheel well inner portions 34, respectively. As a result, the gusset member 51 connects the wheel well inner portion 34 and the rear pillar lower portion 24 b to each other.

As described above, as illustrated in FIG. 8B, a front-side portion of the connecting member 52 is disposed on the bolt holes 51 c of the gusset member 51 fixed to the wheel well inner portion 34 and the rear pillar lower portion 24 b such that the fastening portions 52 c match with the bolt holes 51 c, the connecting member 52 is disposed such that the fastening portions 52 c on the rear-side portion of the connecting member 52 match with the fastening portion 24 c provided on the rear pillar upper portion 24 a, and the connecting member 52 is fastened to the wheel well inner portion 34 and the rear pillar upper portion 24 a. As a result, the connecting member 52 is fixed to the wheel well inner portion 34 and the rear pillar upper portion 24 a.

As described above, by forming the connecting member 52 to be able to be fastened and fixed to the wheel well inner portion 34 and the rear pillar 24, the connecting member 52 can be added later. In other words, the connecting member 52 can be mounted after disposing in-vehicle equipment such as a car speaker on the vehicle-width-direction outer side of the connecting member 52.

As described above, the gusset member 51 and the connecting member 52 have front end portions connected to the ridge portion 34 c and back end portions connected to the rear pillar lower portion 24 b and the rear pillar upper portion 24 a, and the gusset member 51, the connecting member 52, and the rear pillar 24 form a triangular shape.

The wheel well inner portion 34 to which the gusset member 51 and the connecting member 52 are connected is a portion (in other words, the rear damper supporting portion 34 d) to which the suspension damper 18 of the suspension damper 18 is connected, and hence can receive the up-down-direction load input to the wheel well inner portion 34 via the suspension damper 18 by the gusset member 51 and the connecting member 52 and distribute the up-down-direction load to the gusset member 51 and the connecting member 52.

As illustrated in FIG. 9, the connecting member 52 formed as above connects an upper end portion of the rear pillar 24 near the rear header 23 and the ridge portion 34 c near the rear damper supporting portion 34 d to each other. As a result, the annular vehicle body framework F that is substantially annular in front view is formed by the cross member 14 a provided near the rear suspension 17, the pair of left and right side braces 14 b connected to vehicle-width-direction end portions of the cross member 14 a, the rear header 23 provided in the vehicle width direction, and the connecting members 52 that connect the side braces 14 b and an upper end portion of the rear header 23 to each other via the wheel well inner portions 34.

As described above, the vehicle 1 includes, on the vehicle rear side: the pair of left and right side pillars 33 that extend in the vehicle front-rear direction; the cross member 14 a that connects the side pillars 33 to each other in the vehicle width direction; and the rear header 23 that extends in the vehicle width direction on the upper side of the back door opening S1. The vehicle 1 includes: the pair of left and right rear suspensions 17 disposed on the lower surfaces of the side pillars 33 and in the substantially same position as the cross member 14 a in the vehicle front-rear direction; the pair of left and right wheel well inner portions 34 disposed on the vehicle rear side with respect to the cross member 14 a and each having an upper end having the rear damper supporting portion 34 d on which the upper end of the suspension damper 18 is mounted; the pair of left and right side braces 14 b that each connect the place near the cross member 14 a and the place near the rear damper supporting portion 34 d to each other in the vehicle up-down direction; and the pair of left and right connecting members 52 that each connect the place near the rear damper supporting portion 34 d and the place near each end portion of the rear header 23 in the vehicle width direction to each other. The cross member 14 a, the pair of left and right side braces 14 b, the pair of left and right connecting members 52, and the rear header 23 form the annular vehicle body framework F that is substantially annular in front view. As a result, the vehicle-body structure of the vehicle 1 capable of suppressing the distorted deformation of the back door opening S1 can be obtained.

By connecting the place near each of the pair of left and right wheel well inner portions 34 and the place near each end portion of the rear header 23 in the vehicle width direction to each other by each of the pair of left and right connecting members 52, the cross member 14 a, the pair of left and right side braces 14 b, the pair of left and right connecting members 52, and the rear header 23 can form the annular vehicle body framework F that is substantially annular in front view. The cross member 14 a that forms the annular structure is disposed in the substantially same position as the rear suspension 17 in the vehicle front-rear direction, and the connecting member 52 is connected to the place near the rear damper supporting portion 34 d on which the upper end of the suspension damper 18 is mounted, and hence the up-down-direction load input to the rear damper supporting portion 34 d can be received by the annular vehicle body framework F.

In other words, the up-down-direction load input to the rear damper supporting portion 34 d can be transmitted to the place near the rear header 23 as an axial force, and the displacement of the rear damper supporting portion 34 d can be suppressed. As a result, the distorted deformation caused by the transmission of the input up-down-direction load can be suppressed by the corner portion 25 of the back door opening S1 and the like, and the distorted deformation of the back door opening S1 can be suppressed. Therefore, the ride comfort and the steering stability of the occupant can be secured.

The connecting members 52 extend along the side braces 14 b so as to be substantially parallel to the side braces 14 b, and hence the up-down-direction load input from the rear suspension 17 and the rear damper supporting portions 34 d can be transmitted to the connecting members 52 via the side braces 14 b in a continuous manner, and the up-down-direction load can be transmitted in a more efficient manner. Therefore, the input up-down-direction load can be efficiently transmitted to the place near the rear header 23 as the axial force.

The wheel well inner portions 34 each have the ridge portion 34 c at which the arc-shaped wheel well upper surface 34 a that protrudes toward the upper side and the wheel well inner surface 34 b formed on the inner side in the vehicle width direction intersect with each other provided thereon, and each of the connecting members 52 is connected to the ridge portion 34 c. As a result, the connecting member 52 can be connected to the ridge portion 34 c of which rigidity is relatively high, and hence the up-down-direction load input from the rear suspension 17 and the rear damper supporting portion 34 d can be transmitted to the rear header 23 in a continuous manner. As a result, the distorted deformation of the back door opening S1 can be suppressed more.

The connecting members 52 each include the flat surface portion 52 a facing in the vehicle width direction from the end portion (vehicle front-side end portion) on the rear damper supporting portion 34 d side fixed to the rear damper supporting portion 34 d to the end portion (vehicle rear-side end portion) on the rear header 23 side fixed to the rear header 23, and the flat surface portion 52 a is fixed to one surface (fastening portion 24 c) of the rear pillar 24 facing in the vehicle width direction and one surface near the rear damper supporting portion 34 d. As a result, the connecting member 52 can connect the place near the rear damper supporting portion 34 d and the rear pillar 24 to each other in a state in which the flat surface portion 52 a faces in the vehicle width direction without being twisted or curved. Therefore, the connecting portion can transmit the up-down-direction load input from the road surface via a rear suspension damper to the place near the rear header 23 as the axial force in a more efficient manner.

The connecting members 52 each have the bead 52 b that extends in the longitudinal direction provided thereon, and hence the rigidity of the connecting members 52 can be improved without increasing the mass of the connecting members 52. Thus, the up-down-direction load input from the road surface via the rear suspension dampers can be reliably transmitted by the connecting members 52. Therefore, the distorted deformation of the back door opening S1 can be suppressed in a more reliable manner.

The rear pillar 24 that extends from the rear header 23 to the lower side and forms the back door opening S1, and the gusset member 51 that connects the place near the rear damper supporting portion 34 d to which the connecting member 52 is connected and the rear pillar 24 to each other are included. Therefore, the rigidity can be improved, and the up-down-direction load input from the rear damper supporting portion 34 d can be distributed to the connecting member 52 and the gusset member 51 in a more reliable manner. As a result, the distorted deformation of the back door opening S1 can be suppressed in a more reliable manner.

Regarding the correspondence between the configurations of the present disclosure and the abovementioned embodiment, a vehicle body framework that is substantially annular in the vehicle width direction corresponds to the annular vehicle body framework F. Similarly, a rear side frame corresponds to the side pillar 33, a cross member corresponds to the cross member 14 a, a lift gate opening corresponds to the back door opening S1, a rear header corresponds to the rear header 23, a suspension mounting portion corresponds to the rear suspension 17, a suspension damper corresponds to the suspension damper 18, a damper top corresponds to the rear damper supporting portion 34 d, a rear wheel well corresponds to the wheel well inner portion 34, a side brace corresponds to the side brace 14 b, a connecting member corresponds to the connecting member 52, a wheel well upper surface corresponds to the wheel well upper surface 34 a, a wheel well inner surface corresponds to the wheel well inner surface 34 b, a ridge portion corresponds to the ridge portion 34 c, a flat surface portion corresponds to the body 51 a, a bead corresponds to the bead 52 b, a rear pillar corresponds to the rear pillar 24, and a gusset member corresponds to the gusset member 51, but the present disclosure is not limited to the configurations of the abovementioned embodiment and many embodiments can be obtained.

For example, in this embodiment, a case where the vehicle width direction matches with the perpendicular line direction orthogonal to the flat surface portion 52 a in the connecting member 52 is described, but the present disclosure is not limited thereto, and the connecting member 52 may be in a direction in which the flat surface portion 52 a intersects with a direction perpendicular to the vehicle width direction at an angle less than 45 degrees.

The bead 52 b is provided such that one bead 52 b is provided in the longitudinal direction of the connecting member 52 from the vehicle front side toward the vehicle rear side, but a plurality of beads 52 b may be disposed in the longitudinal direction of the connecting member 52 in a continuous manner, for example. 

What is claimed is:
 1. A rear vehicle-body structure of a vehicle, including, on a vehicle rear side: a pair of left and right rear side frames that extend in a vehicle front-rear direction; a cross member that connects the rear side frames to each other in a vehicle width direction; and a rear header that extends in the vehicle width direction on an upper side of a lift gate opening, the vehicle-body structure comprising: a pair of left and right suspension mounting portions disposed on lower surfaces of the rear side frames and in a substantially same position as the cross member in the vehicle front-rear direction; a pair of left and right rear wheel wells disposed on a vehicle rear side with respect to the cross member and each having an upper end having a damper top on which an upper end of a suspension damper is mounted; a pair of left and right side braces that each connect a place near the cross member and a place near the damper top to each other in the vehicle up-down direction; and a pair of left and right connecting members that each connect the place near the damper top and a place near each end portion of the rear header in the vehicle width direction to each other, wherein the cross member, the pair of left and right side braces, the pair of left and right connecting members, and the rear header form an annular structure that is substantially annular in front view.
 2. The rear vehicle-body structure of the vehicle according to claim 1, wherein the connecting members extend along the side braces so as to be substantially parallel to the side braces.
 3. The rear vehicle-body structure of the vehicle according to claim 2, wherein: the rear wheel wells each have a ridge portion at which an arc-shaped wheel well upper surface that protrudes toward the upper side and a wheel well inner surface on an inner side in the vehicle-width-direction intersect with each other provided thereon; and each of the connecting members is connected to the ridge portion.
 4. The rear vehicle-body structure of the vehicle according to claim 3, comprising a rear pillar that extends from the rear header to a lower side and forms the lift gate opening, wherein: the connecting members each include a flat surface portion facing in the vehicle width direction from a damper-top-side end portion fixed to the damper top to a rear-header-side end portion fixed to the rear header; and the flat surface portion is fixed to one surface of the rear pillar facing in the vehicle width direction and one surface near the damper top.
 5. The rear vehicle-body structure of the vehicle according to claim 4, wherein the connecting members each have a bead that extends in a longitudinal direction provided thereon.
 6. The rear vehicle-body structure of the vehicle according to claim 5, comprising: a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other.
 7. The rear vehicle-body structure of the vehicle according to claim 1, wherein: the rear wheel wells each have a ridge portion at which an arc-shaped wheel well upper surface that protrudes toward the upper side and a wheel well inner surface on an inner side in the vehicle-width-direction intersect with each other provided thereon; and each of the connecting members is connected to the ridge portion.
 8. The rear vehicle-body structure of the vehicle according to claim 1, comprising a rear pillar that extends from the rear header to a lower side and forms the lift gate opening, wherein: the connecting members each include a flat surface portion facing in the vehicle width direction from a damper-top-side end portion fixed to the damper top to a rear-header-side end portion fixed to the rear header; and the flat surface portion is fixed to one surface of the rear pillar facing in the vehicle width direction and one surface near the damper top.
 9. The rear vehicle-body structure of the vehicle according to claim 1, wherein the connecting members each have a bead that extends in a longitudinal direction provided thereon.
 10. The rear vehicle-body structure of the vehicle according to claim 1, comprising: a rear pillar that extends from the rear header to a lower side and forms the lift gate opening; and a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other.
 11. The rear vehicle-body structure of the vehicle according to claim 2, comprising a rear pillar that extends from the rear header to a lower side and forms the lift gate opening, wherein: the connecting members each include a flat surface portion facing in the vehicle width direction from a damper-top-side end portion fixed to the damper top to a rear-header-side end portion fixed to the rear header; and the flat surface portion is fixed to one surface of the rear pillar facing in the vehicle width direction and one surface near the damper top.
 12. The rear vehicle-body structure of the vehicle according to claim 2, wherein the connecting members each have a bead that extends in a longitudinal direction provided thereon.
 13. The rear vehicle-body structure of the vehicle according to claim 2, comprising: a rear pillar that extends from the rear header to a lower side and forms the lift gate opening; and a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other.
 14. The rear vehicle-body structure of the vehicle according to claim 7, comprising a rear pillar that extends from the rear header to a lower side and forms the lift gate opening, wherein: the connecting members each include a flat surface portion facing in the vehicle width direction from a damper-top-side end portion fixed to the damper top to a rear-header-side end portion fixed to the rear header; and the flat surface portion is fixed to one surface of the rear pillar facing in the vehicle width direction and one surface near the damper top.
 15. The rear vehicle-body structure of the vehicle according to claim 7, wherein the connecting members each have a bead that extends in a longitudinal direction provided thereon.
 16. The rear vehicle-body structure of the vehicle according to claim 7, comprising: a rear pillar that extends from the rear header to a lower side and forms the lift gate opening; and a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other.
 17. The rear vehicle-body structure of the vehicle according to claim 8, wherein the connecting members each have a bead that extends in a longitudinal direction provided thereon.
 18. The rear vehicle-body structure of the vehicle according to claim 8, comprising: a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other.
 19. The rear vehicle-body structure of the vehicle according to claim 9, comprising: a rear pillar that extends from the rear header to a lower side and forms the lift gate opening; and a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other.
 20. The rear vehicle-body structure of the vehicle according to claim 14, comprising: a gusset member that connects a place near the damper top to which each of the connecting members is connected and the rear pillar to each other. 